package Thread;

//synchronized修饰方法
class Counter{
    public int count = 0;

    synchronized public void add(){//这里进行加锁
        /*
        等价于
        synchronized(this){
            count ++;
        }
         */
        count ++;
    }

    public static void func(){
        //static方法没有this,只能锁类对象
        synchronized (Counter.class){

        }
    }
}

public class Demo20 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();

        Thread t1 = new Thread(()-> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });

        Thread t2 = new Thread(()-> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println("count =" + counter);
    }
}